Room Temperature Synthesis of Lead-Free Sn/Ge-Based Perovskite Quantum Dots
Room Temperature Synthesis of Lead-Free Sn/Ge-Based Perovskite Quantum Dots
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DOI：
10.1109/pvsc40753.2019.8980853
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发表时间：
2019-06
期刊：
影响因子：
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通讯作者：
Zeying Chen;Pravakar P. Rajbhandari;T. Dhakal
中科院分区：
文献类型：
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作者：
Zeying Chen;Pravakar P. Rajbhandari;T. Dhakal
金属卤化物钙钛矿作为光伏器件受到了广泛的关注。它们已经实现了高于23%的功率转换效率，可与硅基光伏相媲美。然而，只有铅基钙钛矿才能获得这些卓越的效率，而且这种设备在空气和潮湿的环境中化学不稳定。因此，钙钛矿型太阳能电池能否得到广泛应用，关键在于解决其毒性和不稳定性问题。我们已经接受了用其他无毒或毒性较低的元素取代铅的挑战，例如锡和锗。采用室温法制备了Cs(SnGe)X3(X=I，BrCl3)量子点。X射线衍射结果表明，所合成的量子点为黄色六方相，并从晶体的六角形结构中得到进一步证实。
Metal halide perovskites have received remarkable attention as photovoltaic (PV) devices. These have already achieved power conversion efficiency higher than 23% rivaling that of silicon-based PV. However, these outstanding efficiencies can only be acquired with lead-based perovskites and the devices are chemically unstable in air and moisture. Therefore, the key to the widespread deployment of perovskite-based solar cell will come down to address their "toxicity" and instability problems. We have taken the challenge to replace lead with other nontoxic or less toxic elements, e.g., Sn, and Ge. We have synthesized Cs(Sn,Ge)X3 (X=I, Br, and Cl) quantum dots (QDs) using room temperature process. The XRD data showed that the synthesized QDs were yellow hexagonal phase, which was further confirmed by the hexagonal shape of the TEM images of the crystals.